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esp-idf/components/lwip/Kconfig

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menu "LWIP"
config L2_TO_L3_COPY
bool "Enable copy between Layer2 and Layer3 packets"
default n
help
If this feature is enabled, all traffic from layer2(WIFI Driver) will be
copied to a new buffer before sending it to layer3(LWIP stack), freeing
the layer2 buffer.
Please be notified that the total layer2 receiving buffer is fixed and
ESP32 currently supports 25 layer2 receiving buffer, when layer2 buffer
runs out of memory, then the incoming packets will be dropped in hardware.
The layer3 buffer is allocated from the heap, so the total layer3 receiving
buffer depends on the available heap size, when heap runs out of memory,
no copy will be sent to layer3 and packet will be dropped in layer2.
Please make sure you fully understand the impact of this feature before
enabling it.
config LWIP_MAX_SOCKETS
int "Max number of open sockets"
range 1 32
default 10
help
Sockets take up a certain amount of memory, and allowing fewer
sockets to be open at the same time conserves memory. Specify
the maximum amount of sockets here. The valid value is from 1
to 16.
config LWIP_SO_REUSE
bool "Enable SO_REUSEADDR option"
default y
help
Enabling this option allows binding to a port which remains in
TIME_WAIT.
config LWIP_SO_REUSE_RXTOALL
bool "SO_REUSEADDR copies broadcast/multicast to all matches"
depends on LWIP_SO_REUSE
default y
help
Enabling this option means that any incoming broadcast or multicast
packet will be copied to all of the local sockets that it matches
(may be more than one if SO_REUSEADDR is set on the socket.)
This increases memory overhead as the packets need to be copied,
however they are only copied per matching socket. You can safely
disable it if you don't plan to receive broadcast or multicast
traffic on more than one socket at a time.
config LWIP_SO_RCVBUF
bool "Enable SO_RCVBUF option"
default n
help
Enabling this option allows checking for available data on a netconn.
config LWIP_DHCP_MAX_NTP_SERVERS
int "Maximum number of NTP servers"
default 1
range 1 16
help
Set maximum number of NTP servers used by LwIP SNTP module.
First argument of sntp_setserver/sntp_setservername functions
is limited to this value.
config LWIP_IP_FRAG
bool "Enable fragment outgoing IP packets"
default n
help
Enabling this option allows fragmenting outgoing IP packets if their size
exceeds MTU.
config LWIP_IP_REASSEMBLY
bool "Enable reassembly incoming fragmented IP packets"
default n
help
Enabling this option allows reassemblying incoming fragmented IP packets.
config LWIP_STATS
bool "Enable LWIP statistics"
default n
help
Enabling this option allows LWIP statistics
config LWIP_ETHARP_TRUST_IP_MAC
bool "Enable LWIP ARP trust"
default y
help
Enabling this option allows ARP table to be updated.
If this option is enabled, the incoming IP packets cause the ARP table to be
updated with the source MAC and IP addresses supplied in the packet.
You may want to disable this if you do not trust LAN peers to have the
correct addresses, or as a limited approach to attempt to handle
spoofing. If disabled, lwIP will need to make a new ARP request if
the peer is not already in the ARP table, adding a little latency.
The peer *is* in the ARP table if it requested our address before.
Also notice that this slows down input processing of every IP packet!
config TCPIP_RECVMBOX_SIZE
int "TCPIP receive mail box size"
default 32
range 6 64
help
Set TCPIP receive mail box size. Generally bigger value means higher throughput
but more memory. The value should be bigger than UDP/TCP mail box size.
config LWIP_DHCP_DOES_ARP_CHECK
bool "DHCP: Perform ARP check on any offered address"
default y
help
Enabling this option performs a check (via ARP request) if the offered IP address
is not already in use by another host on the network.
menuconfig LWIP_AUTOIP
bool "Enable IPV4 Link-Local Addressing (AUTOIP)"
default n
help
Enabling this option allows the device to self-assign an address
in the 169.256/16 range if none is assigned statically or via DHCP.
See RFC 3927.
config LWIP_AUTOIP_TRIES
int "DHCP Probes before self-assigning IPv4 LL address"
range 1 100
default 2
depends on LWIP_AUTOIP
help
DHCP client will send this many probes before self-assigning a
link local address.
From LWIP help: "This can be set as low as 1 to get an AutoIP
address very quickly, but you should be prepared to handle a
changing IP address when DHCP overrides AutoIP." (In the case of
ESP-IDF, this means multiple SYSTEM_EVENT_STA_GOT_IP events.)
config LWIP_AUTOIP_MAX_CONFLICTS
int "Max IP conflicts before rate limiting"
range 1 100
default 9
depends on LWIP_AUTOIP
help
If the AUTOIP functionality detects this many IP conflicts while
self-assigning an address, it will go into a rate limited mode.
config LWIP_AUTOIP_RATE_LIMIT_INTERVAL
int "Rate limited interval (seconds)"
range 5 120
default 20
depends on LWIP_AUTOIP
help
If rate limiting self-assignment requests, wait this long between
each request.
menuconfig LWIP_NETIF_LOOPBACK
bool "Support per-interface loopback"
default y
help
Enabling this option means that if a packet is sent with a destination
address equal to the interface's own IP address, it will "loop back" and
be received by this interface.
config LWIP_LOOPBACK_MAX_PBUFS
int "Max queued loopback packets per interface"
range 0 16
default 8
depends on LWIP_NETIF_LOOPBACK
help
Configure the maximum number of packets which can be queued for
loopback on a given interface. Reducing this number may cause packets
to be dropped, but will avoid filling memory with queued packet data.
menu "TCP"
config TCP_MAXRTX
int "Maximum number of retransmissions of data segments"
default 12
range 3 12
help
Set maximum number of retransmissions of data segments.
config TCP_SYNMAXRTX
int "Maximum number of retransmissions of SYN segments"
default 6
range 3 12
help
Set maximum number of retransmissions of SYN segments.
config TCP_MSS
int "Maximum Segment Size (MSS)"
default 1436
range 1220 1436
help
Set maximum segment size for TCP transmission.
Can be set lower to save RAM, the default value 1436 will give best throughput.
config TCP_MSL
int "Maximum segment lifetime (MSL)"
default 60000
help
Set maximum segment lifetime in in milliseconds.
config TCP_SND_BUF_DEFAULT
int "Default send buffer size"
default 5744 # 4 * default MSS
range 2440 65535
help
Set default send buffer size for new TCP sockets.
Per-socket send buffer size can be changed at runtime
with lwip_setsockopt(s, TCP_SNDBUF, ...).
This value must be at least 2x the MSS size, and the default
is 4x the default MSS size.
Setting a smaller default SNDBUF size can save some RAM, but
will decrease performance.
config TCP_WND_DEFAULT
int "Default receive window size"
default 5744 # 4 * default MSS
range 2440 65535
help
Set default TCP receive window size for new TCP sockets.
Per-socket receive window size can be changed at runtime
with lwip_setsockopt(s, TCP_WINDOW, ...).
Setting a smaller default receive window size can save some RAM,
but will significantly decrease performance.
config TCP_RECVMBOX_SIZE
int "Default TCP receive mail box size"
default 6
range 6 64
help
Set TCP receive mail box size. Generally bigger value means higher throughput
but more memory. The recommended value is: TCP_WND_DEFAULT/TCP_MSS + 2, e.g. if
TCP_WND_DEFAULT=14360, TCP_MSS=1436, then the recommended receive mail box size is
(14360/1436 + 2) = 12.
TCP receive mail box is a per socket mail box, when the application receives packets
from TCP socket, LWIP core firstly posts the packets to TCP receive mail box and the
application then fetches the packets from mail box. It means LWIP can caches maximum
TCP_RECCVMBOX_SIZE packets for each TCP socket, so the maximum possible cached TCP packets
for all TCP sockets is TCP_RECCVMBOX_SIZE multiples the maximum TCP socket number. In other
words, the bigger TCP_RECVMBOX_SIZE means more memory.
On the other hand, if the receiv mail box is too small, the mail box may be full. If the
mail box is full, the LWIP drops the packets. So generally we need to make sure the TCP
receive mail box is big enough to avoid packet drop between LWIP core and application.
config TCP_QUEUE_OOSEQ
bool "Queue incoming out-of-order segments"
default y
help
Queue incoming out-of-order segments for later use.
Disable this option to save some RAM during TCP sessions, at the expense
of increased retransmissions if segments arrive out of order.
choice TCP_OVERSIZE
prompt "Pre-allocate transmit PBUF size"
default TCP_OVERSIZE_MSS
help
Allows enabling "oversize" allocation of TCP transmission pbufs ahead of time,
which can reduce the length of pbuf chains used for transmission.
This will not make a difference to sockets where Nagle's algorithm
is disabled.
Default value of MSS is fine for most applications, 25% MSS may save
some RAM when only transmitting small amounts of data. Disabled will
have worst performance and fragmentation characteristics, but uses
least RAM overall.
config TCP_OVERSIZE_MSS
bool "MSS"
config TCP_OVERSIZE_QUARTER_MSS
bool "25% MSS"
config TCP_OVERSIZE_DISABLE
bool "Disabled"
endchoice
endmenu # TCP
menu "UDP"
config UDP_RECVMBOX_SIZE
int "Default UDP receive mail box size"
default 6
range 6 64
help
Set UDP receive mail box size. The recommended value is 6.
UDP receive mail box is a per socket mail box, when the application receives packets
from UDP socket, LWIP core firstly posts the packets to UDP receive mail box and the
application then fetches the packets from mail box. It means LWIP can caches maximum
UDP_RECCVMBOX_SIZE packets for each UDP socket, so the maximum possible cached UDP packets
for all UDP sockets is UDP_RECCVMBOX_SIZE multiples the maximum UDP socket number. In other
words, the bigger UDP_RECVMBOX_SIZE means more memory.
On the other hand, if the receiv mail box is too small, the mail box may be full. If the
mail box is full, the LWIP drops the packets. So generally we need to make sure the UDP
receive mail box is big enough to avoid packet drop between LWIP core and application.
endmenu # UDP
config TCPIP_TASK_STACK_SIZE
int "TCP/IP Task Stack Size"
default 2560
# for high log levels, tcpip_adapter API calls can end up
# a few calls deep and logging there can trigger a stack overflow
range 2560 65536 if LOG_DEFAULT_LEVEL < 4 || NEWLIB_NANO_FORMAT
range 3072 65536 if LOG_DEFAULT_LEVEL >= 4 && !NEWLIB_NANO_FORMAT
help
Configure TCP/IP task stack size, used by LWIP to process multi-threaded TCP/IP operations.
Setting this stack too small will result in stack overflow crashes.
menuconfig PPP_SUPPORT
bool "Enable PPP support (new/experimental)"
default n
help
Enable PPP stack. Now only PPP over serial is possible.
PPP over serial support is experimental and unsupported.
config PPP_PAP_SUPPORT
bool "Enable PAP support"
depends on PPP_SUPPORT
default n
help
Enable Password Authentication Protocol (PAP) support
config PPP_CHAP_SUPPORT
bool "Enable CHAP support"
depends on PPP_SUPPORT
default n
help
Enable Challenge Handshake Authentication Protocol (CHAP) support
config PPP_MSCHAP_SUPPORT
bool "Enable MSCHAP support"
depends on PPP_SUPPORT
default n
help
Enable Microsoft version of the Challenge-Handshake Authentication Protocol (MSCHAP) support
config PPP_MPPE_SUPPORT
bool "Enable MPPE support"
depends on PPP_SUPPORT
default n
help
Enable Microsoft Point-to-Point Encryption (MPPE) support
config PPP_DEBUG_ON
bool "Enable PPP debug log output"
depends on PPP_SUPPORT
default n
help
Enable PPP debug log output
menu "ICMP"
config LWIP_MULTICAST_PING
bool "Respond to multicast pings"
default n
config LWIP_BROADCAST_PING
bool "Respond to broadcast pings"
default n
endmenu # ICMP
endmenu
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